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authorYu Kuai <yukuai3@huawei.com>2022-10-19 15:15:16 +0300
committerJens Axboe <axboe@kernel.dk>2022-10-24 03:59:17 +0300
commit3642ef4d95699193c4a461862382e643ae3720f0 (patch)
treee0a696d7266ff27dadb46349b6bde22da71ea6e1 /block/blk-sysfs.c
parenta9a236d238a5e8ab2e74ca62c2c7ba5dd435af77 (diff)
downloadlinux-3642ef4d95699193c4a461862382e643ae3720f0.tar.xz
blk-wbt: don't show valid wbt_lat_usec in sysfs while wbt is disabled
Currently, if wbt is initialized and then disabled by wbt_disable_default(), sysfs will still show valid wbt_lat_usec, which will confuse users that wbt is still enabled. This patch shows wbt_lat_usec as zero if it's disabled. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reported-and-tested-by: Holger Hoffstätte <holger@applied-asynchrony.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20221019121518.3865235-5-yukuai1@huaweicloud.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-sysfs.c')
-rw-r--r--block/blk-sysfs.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index e71b3b43927c..7b98c7074771 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -470,6 +470,9 @@ static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
if (!wbt_rq_qos(q))
return -EINVAL;
+ if (wbt_disabled(q))
+ return sprintf(page, "0\n");
+
return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000));
}